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A heap buffer overflow was found in libsoup's WebSocket permessage-deflate outgoing path.

soup_websocket_extension_deflate_process_outgoing_message() stored deflateBound()'s uLong result in a guint and grew a GByteArray by that amount. For payloads approaching 4 GiB, the bound exceeds G_MAXUINT; truncation allowed buffer->len + max_length to wrap on later growth, and zlib wrote through next_out past the allocation.

Fixed by refusing payloads whose compressed bound cannot fit in a GByteArray and by checking each incremental growth (commit dbd0417e, libsoup 3.7.3).

References:
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/554 (Bug 8)
https://gitlab.gnome.org/GNOME/libsoup/-/commit/dbd0417e